Oskar Groening (C), defendant and former Nazi SS officer dubbed the "bookkeeper of Auschwitz", sits beside his advocate in the courtroom prior to the continuation of his trial in Lueneburg, Germany, July 7 2015. Groening is accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. REUTERS/Axel Heimken/Pool 

Oskar Groening (L), defendant and former Nazi SS officer dubbed the "bookkeeper of Auschwitz", sits beside his advocate in the courtroom prior to the continuation of his trial in Lueneburg, Germany, July 7 2015. Groening is accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. REUTERS/Axel Heimken/Pool 

Oskar Groening (2nd L), defendant and former Nazi SS officer dubbed the "bookkeeper of Auschwitz", arrives beside his advocate in the courtroom prior to the continuation of his trial in Lueneburg, Germany, July 7 2015. Groening is accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. REUTERS/Axel Heimken/Pool 

Oskar Groening (2nd L), defendant and former Nazi SS officer dubbed the "bookkeeper of Auschwitz", arrives beside his advocate in the courtroom prior to the continuation of his trial in Lueneburg, Germany, July 7 2015. Groening is accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. REUTERS/Axel Heimken/Pool 

Oskar Groening, defendant and former Nazi SS officer dubbed the "bookkeeper of Auschwitz", sits beside his advocate in the courtroom prior to the continuation of his trial in Lueneburg, Germany, July 7, 2015. Groening is accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. REUTERS/Axel Heimken/Pool 

Defendant and former Nazi SS officer Oskar Groening, dubbed the "bookkeeper of Auschwitz", sits in the courtroom prior to the continuation of his trial in Lueneburg, Germany, July 7, 2015. Groening is accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. REUTERS/Philipp Schulze/Pool 

Defendant and former Nazi SS officer Oskar Groening, dubbed the "bookkeeper of Auschwitz", sits in the courtroom prior to the continuation of his trial in Lueneburg, Germany, July 7, 2015. Groening is accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. REUTERS/Philipp Schulze/Pool 

Defendant and former Nazi SS officer Oskar Groening, dubbed the "bookkeeper of Auschwitz", is helped into the courtroom prior to the continuation of his trial in Lueneburg, Germany, July 7, 2015. Groening is accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. REUTERS/Philipp Schulze/Pool 

Defendant and former Nazi SS officer Oskar Groening, dubbed the "bookkeeper of Auschwitz", sits in the courtroom ahead of his trial in the 'Ritterakademie' venue in Lueneburg, Germany, July 1, 2015. Groening is accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. REUTERS/Ronny Hartmann/Pool 

Defendant and former Nazi SS officer Oskar Groening, dubbed the "bookkeeper of Auschwitz", sits in the courtroom ahead of his trial in the 'Ritterakademie' venue in Lueneburg, Germany, July 1, 2015. Groening is accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. REUTERS/Philipp Schulze/Pool 

Defendant and former Nazi SS officer Oskar Groening, dubbed the "bookkeeper of Auschwitz", sits in the courtroom ahead of his trial in the 'Ritterakademie' venue in Lueneburg, Germany, July 1, 2015. Groening is accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. REUTERS/Ronny Hartmann/Pool 

Former prisoner of Auschwitz concentration camp and plaintiff Irene Weiss arrives for the trial of former Nazi SS officer Oskar Groening (unseen), dubbed the "bookkeeper of Auschwitz", at the courtroom in the 'Ritterakademie' venue in Lueneburg, Germany, July 1, 2015. Groening is accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. REUTERS/Ronny Hartmann/Pool 

Defendant and former Nazi SS officer Oskar Groening, dubbed the "bookkeeper of Auschwitz", takes a seat in the courtroom ahead of his trial in the 'Ritterakademie' venue in Lueneburg, Germany, July 1, 2015. Groening is accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. REUTERS/Philipp Schulze/Pool 

Defendant and former Nazi SS officer Oskar Groening, dubbed the "bookkeeper of Auschwitz", sits in the courtroom ahead of his trial in the 'Ritterakademie' venue in Lueneburg, Germany, July 1, 2015. Groening is accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. REUTERS/Philipp Schulze/Pool 

Former prisoner of Auschwitz concentration camp and plaintiff Irene Weiss arrives for the trial of former Nazi SS officer Oskar Groening (unseen), dubbed the "bookkeeper of Auschwitz", at the courtroom in the 'Ritterakademie' venue in Lueneburg, Germany, July 1, 2015. Groening is accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. REUTERS/Ronny Hartmann/Pool 

Former prisoner of Auschwitz concentration camp and plaintiff Hedy Bohm arrives for the trial of former Nazi SS officer Oskar Groening (unseen), dubbed the "bookkeeper of Auschwitz", at the courtroom in the 'Ritterakademie' venue in Lueneburg, Germany, July 1, 2015. Groening is accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. REUTERS/Ronny Hartmann/Pool 

Lawyer of the plaintiffs Thomas Walther is pictured ahead of the trial of former Nazi SS officer Oskar Groening (unseen), dubbed the "bookkeeper of Auschwitz", at the courtroom in the 'Ritterakademie' venue in Lueneburg, Germany, July 1, 2015. Groening is accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. REUTERS/Ronny Hartmann/Pool 

Former prisoner of Auschwitz concentration camp and plaintiff Irene Weiss arrives for the trial of former Nazi SS officer Oskar Groening (unseen), dubbed the "bookkeeper of Auschwitz", at the courtroom in the 'Ritterakademie' venue in Lueneburg, Germany, July 1, 2015. Groening is accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. REUTERS/Ronny Hartmann/Pool 

Former prisoner of Auschwitz concentration camp and plaintiff Irene Weiss arrives for the trial of former Nazi SS officer Oskar Groening (unseen), dubbed the "bookkeeper of Auschwitz", at the courtroom in the 'Ritterakademie' venue in Lueneburg, Germany, July 1, 2015. Groening is accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. REUTERS/Ronny Hartmann/Pool 

Defendant and former Nazi SS officer Oskar Groening, dubbed the "bookkeeper of Auschwitz", sits in the courtroom ahead of his trial in the 'Ritterakademie' venue in Lueneburg, Germany, July 1, 2015. Groening is accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. REUTERS/Ronny Hartmann/Pool 

Former prisoner of Auschwitz concentration camp and plaintiff Irene Weiss arrives for the trial of former Nazi SS officer Oskar Groening (unseen), dubbed the "bookkeeper of Auschwitz", at the courtroom in the 'Ritterakademie' venue in Lueneburg, Germany, July 1, 2015. Groening is accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. REUTERS/Ronny Hartmann/Pool 

Defendant and former Nazi SS officer Oskar Groening, dubbed the "bookkeeper of Auschwitz", enters the courtroom to attend his trial in the 'Ritterakademie' venue in Lueneburg, Germany, July 1, 2015. Groening is accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. REUTERS/Ronny Hartmann/Pool 

Defendant and former Nazi SS officer Oskar Groening, dubbed the "bookkeeper of Auschwitz", attends his trial at the courtroom in the 'Ritterakademie' venue in Lueneburg, Germany, July 1, 2015. Groening is accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. REUTERS/Ronny Hartmann/Pool 

Defendant Oskar Groening receives help to get in a car after the first day of his trial in Lueneburg April 21, 2015. Groening, a 93-year-old former bookkeeper at Auschwitz goes on trial in Germany on Tuesday, accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. The trial of Groening, who was 21 and by his own admission an enthusiastic Nazi when he was sent to Auschwitz in 1942, may turn out to be one of the last big Holocaust trials because so few Nazis suspected of committing crimes during World War Two are still alive. REUTERS/Fabian Bimmer 

Defendant Oskar Groening receives help to get in a car after the first day of his trial in Lueneburg April 21, 2015. Groening, a 93-year-old former bookkeeper at Auschwitz goes on trial in Germany on Tuesday, accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. The trial of Groening, who was 21 and by his own admission an enthusiastic Nazi when he was sent to Auschwitz in 1942, may turn out to be one of the last big Holocaust trials because so few Nazis suspected of committing crimes during World War Two are still alive. REUTERS/Fabian Bimmer 

Defendant Oskar Groening(R) leaves the court after the first day of his trial in Lueneburg April 21, 2015. Groening, a 93-year-old former bookkeeper at Auschwitz goes on trial in Germany on Tuesday, accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. The trial of Groening, who was 21 and by his own admission an enthusiastic Nazi when he was sent to Auschwitz in 1942, may turn out to be one of the last big Holocaust trials because so few Nazis suspected of committing crimes during World War Two are still alive. REUTERS/Fabian Bimmer 

Defendant Oskar Groening(R) leaves the court after the first day of his trial in Lueneburg April 21, 2015. Groening, a 93-year-old former bookkeeper at Auschwitz goes on trial in Germany on Tuesday, accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. The trial of Groening, who was 21 and by his own admission an enthusiastic Nazi when he was sent to Auschwitz in 1942, may turn out to be one of the last big Holocaust trials because so few Nazis suspected of committing crimes during World War Two are still alive. REUTERS/Fabian Bimmer 

Defendant Oskar Groening sits outside in the sunshine during a break in proceedings in his trial in Lueneburg April 21, 2015. A 93-year-old former bookkeeper at Auschwitz goes on trial in Germany on Tuesday, accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. The trial of Groening, who was 21 and by his own admission an enthusiastic Nazi when he was sent to Auschwitz in 1942, may turn out to be one of the last big Holocaust trials because so few Nazis suspected of committing crimes during World War Two are still alive. REUTERS/Fabian Bimmer

Defendant Oskar Groening sits outside in the sunshine during a break in proceedings in his trial in Lueneburg April 21, 2015. A 93-year-old former bookkeeper at Auschwitz goes on trial in Germany on Tuesday, accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. The trial of Groening, who was 21 and by his own admission an enthusiastic Nazi when he was sent to Auschwitz in 1942, may turn out to be one of the last big Holocaust trials because so few Nazis suspected of committing crimes during World War Two are still alive. REUTERS/Fabian Bimmer

Defendant Oskar Groening is pictured between Auschwitz German Nazi extermination and concentration camp survivors Eva Pusztai-Fahidi (R) and Hedy Bohm (L) as he waits for the start of his trial in a courtroom in Lueneburg April 21, 2015. A 93-year-old former bookkeeper at Auschwitz goes on trial in Germany on Tuesday, accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. The trial of Groening, who was 21 and by his own admission an enthusiastic Nazi when he was sent to Auschwitz in 1942, may turn out to be one of the last big Holocaust trials because so few Nazis suspected of committing crimes during World War Two are still alive. REUTERS/Julian Stratenschulte/Pool

German right-wing activist Thomas Wulff (background C) waits in front of the court-house prior to the start of the trail against Oskar Groening in Lueneburg April 21, 2015. A 93-year-old former bookkeeper at Auschwitz goes on trial in Germany on Tuesday, accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. The trial of Groening, who was 21 and by his own admission an enthusiastic Nazi when he was sent to Auschwitz in 1942, may turn out to be one of the last big Holocaust trials because so few Nazis suspected of committing crimes during World War Two are still alive. REUTERS/Fabian Bimmer

Prosecutor Jens Lehmann arrives for the opening of the trial against Oskar Groening in a courtroom in Lueneburg April 21, 2015. A 93-year-old former bookkeeper at Auschwitz goes on trial in Germany on Tuesday, accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. The trial of Groening, who was 21 and by his own admission an enthusiastic Nazi when he was sent to Auschwitz in 1942, may turn out to be one of the last big Holocaust trials because so few Nazis suspected of committing crimes during World War Two are still alive. REUTERS/Ronny Hartmann/Pool

Defendant Oskar Groening waits with his laywers Hans Holtermann (R) and Susanne Frangenberg (L) for the start of his trial in a courtroom in Lueneburg April 21, 2015. A 93-year-old former bookkeeper at Auschwitz goes on trial in Germany on Tuesday, accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. The trial of Groening, who was 21 and by his own admission an enthusiastic Nazi when he was sent to Auschwitz in 1942, may turn out to be one of the last big Holocaust trials because so few Nazis suspected of committing crimes during World War Two are still alive. REUTERS/Ronny Hartmann/Pool

Chief Judge Franz Kompisch arrives for the opening of the trial against Oskar Groening in a courtroom in Lueneburg April 21, 2015. A 93-year-old former bookkeeper at Auschwitz goes on trial in Germany on Tuesday, accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. The trial of Groening, who was 21 and by his own admission an enthusiastic Nazi when he was sent to Auschwitz in 1942, may turn out to be one of the last big Holocaust trials because so few Nazis suspected of committing crimes during World War Two are still alive. REUTERS/Ronny Hartmann/Pool

Defendant Oskar Groening arrives with his laywer Hans Holtermann (R) for the start of his trial in a courtroom in Lueneburg April 21, 2015. A 93-year-old former bookkeeper at Auschwitz goes on trial in Germany on Tuesday, accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. The trial of Groening, who was 21 and by his own admission an enthusiastic Nazi when he was sent to Auschwitz in 1942, may turn out to be one of the last big Holocaust trials because so few Nazis suspected of committing crimes during World War Two are still alive. REUTERS/Julian Stratenschulte/Pool

Defendant Oskar Groening waits with his laywer Hans Holtermann (R) before the start of his trial in a courtroom in Lueneburg April 21, 2015. A 93-year-old former bookkeeper at Auschwitz goes on trial in Germany on Tuesday, accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. The trial of Groening, who was 21 and by his own admission an enthusiastic Nazi when he was sent to Auschwitz in 1942, may turn out to be one of the last big Holocaust trials because so few Nazis suspected of committing crimes during World War Two are still alive. REUTERS/Ronny Hartmann/Pool

Defendant Oskar Groening waits with his laywer Hans Holtermann (R) before the start of his trial in a courtroom in Lueneburg April 21, 2015. A 93-year-old former bookkeeper at Auschwitz goes on trial in Germany on Tuesday, accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. The trial of Groening, who was 21 and by his own admission an enthusiastic Nazi when he was sent to Auschwitz in 1942, may turn out to be one of the last big Holocaust trials because so few Nazis suspected of committing crimes during World War Two are still alive. REUTERS/Julian Stratenschulte/Pool

General view of the cout before the start of the trial against Oskar Groening in Lueneburg April 21, 2015. A 93-year-old former bookkeeper at Auschwitz goes on trial in Germany on Tuesday, accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. The trial of Groening, who was 21 and by his own admission an enthusiastic Nazi when he was sent to Auschwitz in 1942, may turn out to be one of the last big Holocaust trials because so few Nazis suspected of committing crimes during World War Two are still alive. REUTERS/Julian Stratenschulte/Pool

Auschwitz German Nazi extermination and concentration camp survivor and plaintiff Eva Pusztai-Fahidi (R) and her granddaughter Luca Hartai wait for the start of the trial against Oskar Groening in a courtroom in Lueneburg April 21, 2015. A 93-year-old former bookkeeper at Auschwitz goes on trial in Germany on Tuesday, accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. The trial of Groening, who was 21 and by his own admission an enthusiastic Nazi when he was sent to Auschwitz in 1942, may turn out to be one of the last big Holocaust trials because so few Nazis suspected of committing crimes during World War Two are still alive. REUTERS/Ronny Hartmann/Pool

Auschwitz German Nazi extermination and concentration camp survivor and plaintiff Eva Pusztai-Fahidi (R) and her granddaughter Luca Hartai wait for the start of the trial against Oskar Groening in a courtroom in Lueneburg April 21, 2015. A 93-year-old former bookkeeper at Auschwitz goes on trial in Germany on Tuesday, accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. The trial of Groening, who was 21 and by his own admission an enthusiastic Nazi when he was sent to Auschwitz in 1942, may turn out to be one of the last big Holocaust trials because so few Nazis suspected of committing crimes during World War Two are still alive. REUTERS/Ronny Hartmann/Pool

Auschwitz German Nazi extermination and concentration camp survivors Eva Pusztai-Fahidi (L) and Hedy Bohm wait for the start of the trial against Oskar Groening in a courtroom in Lueneburg April 21, 2015. A 93-year-old former bookkeeper at Auschwitz goes on trial in Germany on Tuesday, accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. The trial of Groening, who was 21 and by his own admission an enthusiastic Nazi when he was sent to Auschwitz in 1942, may turn out to be one of the last big Holocaust trials because so few Nazis suspected of committing crimes during World War Two are still alive. REUTERS/Ronny Hartmann/Pool

Auschwitz German Nazi extermination and concentration camp survivors Eva Pusztai-Fahidi (L) and Hedy Bohm wait for the start of the trial against Oskar Groening in a courtroom in Lueneburg April 21, 2015. A 93-year-old former bookkeeper at Auschwitz goes on trial in Germany on Tuesday, accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. The trial of Groening, who was 21 and by his own admission an enthusiastic Nazi when he was sent to Auschwitz in 1942, may turn out to be one of the last big Holocaust trials because so few Nazis suspected of committing crimes during World War Two are still alive. REUTERS/Ronny Hartmann/Pool

Defendant Oskar Groening waits with his laywers Hans Holtermann (R) and Susanne Frangenberg (L) for the start of his trial in a courtroom in Lueneburg April 21, 2015. A 93-year-old former bookkeeper at Auschwitz goes on trial in Germany on Tuesday, accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. The trial of Groening, who was 21 and by his own admission an enthusiastic Nazi when he was sent to Auschwitz in 1942, may turn out to be one of the last big Holocaust trials because so few Nazis suspected of committing crimes during World War Two are still alive. REUTERS/Julian Stratenschulte/Pool

Defendant Oskar Groening waits for the start of his trial in a courtroom in Lueneburg April 21, 2015. A 93-year-old former bookkeeper at Auschwitz goes on trial in Germany on Tuesday, accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. The trial of Groening, who was 21 and by his own admission an enthusiastic Nazi when he was sent to Auschwitz in 1942, may turn out to be one of the last big Holocaust trials because so few Nazis suspected of committing crimes during World War Two are still alive. REUTERS/Julian Stratenschulte/Pool

Defendant Oskar Groening waits for the start of his trial in a courtroom in Lueneburg April 21, 2015. A 93-year-old former bookkeeper at Auschwitz goes on trial in Germany on Tuesday, accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. The trial of Groening, who was 21 and by his own admission an enthusiastic Nazi when he was sent to Auschwitz in 1942, may turn out to be one of the last big Holocaust trials because so few Nazis suspected of committing crimes during World War Two are still alive. REUTERS/Julian Stratenschulte/Pool

Auschwitz German Nazi extermination and concentration camp survivor and plaintiff Eva Pusztai-Fahidi (R) and her granddaughter Luca Hartai wait for the start of the trial against Oskar Groening in a courtroom in Lueneburg April 21, 2015. A 93-year-old former bookkeeper at Auschwitz goes on trial in Germany on Tuesday, accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. The trial of Groening, who was 21 and by his own admission an enthusiastic Nazi when he was sent to Auschwitz in 1942, may turn out to be one of the last big Holocaust trials because so few Nazis suspected of committing crimes during World War Two are still alive. REUTERS/Ronny Hartmann/Pool

Defendant Oskar Groening (C) arrives for the start of his trial in a courtroom in Lueneburg April 21, 2015. A 93-year-old former bookkeeper at Auschwitz goes on trial in Germany on Tuesday, accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. The trial of Groening, who was 21 and by his own admission an enthusiastic Nazi when he was sent to Auschwitz in 1942, may turn out to be one of the last big Holocaust trials because so few Nazis suspected of committing crimes during World War Two are still alive. REUTERS/Julian Stratenschulte/Pool

Defendant Oskar Groening (C) arrives for the start of his trial in a courtroom in Lueneburg April 21, 2015. A 93-year-old former bookkeeper at Auschwitz goes on trial in Germany on Tuesday, accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. The trial of Groening, who was 21 and by his own admission an enthusiastic Nazi when he was sent to Auschwitz in 1942, may turn out to be one of the last big Holocaust trials because so few Nazis suspected of committing crimes during World War Two are still alive. REUTERS/Julian Stratenschulte/Pool

Defendant Oskar Groening (C) arrives for the start of his trial in a courtroom in Lueneburg April 21, 2015. A 93-year-old former bookkeeper at Auschwitz goes on trial in Germany on Tuesday, accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. The trial of Groening, who was 21 and by his own admission an enthusiastic Nazi when he was sent to Auschwitz in 1942, may turn out to be one of the last big Holocaust trials because so few Nazis suspected of committing crimes during World War Two are still alive. REUTERS/Julian Stratenschulte/Pool

Defendant Oskar Groening waits for the opening of his trial in a courtroom in Lueneburg April 21, 2015. A 93-year-old former bookkeeper at Auschwitz goes on trial in Germany on Tuesday, accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. The trial of Groening, who was 21 and by his own admission an enthusiastic Nazi when he was sent to Auschwitz in 1942, may turn out to be one of the last big Holocaust trials because so few Nazis suspected of committing crimes during World War Two are still alive. REUTERS/Ronny Hartmann/Pool

Defendant Oskar Groening waits for the opening of his trial in a courtroom in Lueneburg April 21, 2015. A 93-year-old former bookkeeper at Auschwitz goes on trial in Germany on Tuesday, accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. The trial of Groening, who was 21 and by his own admission an enthusiastic Nazi when he was sent to Auschwitz in 1942, may turn out to be one of the last big Holocaust trials because so few Nazis suspected of committing crimes during World War Two are still alive. REUTERS/Ronny Hartmann/Pool

Hedy Bohm, a survivor of Auschwitz German Nazi concentration and extermination camp, arrives at the court in Lueneburg April 21, 2015, for the opening of the trail against Oskar Groening. A 93-year-old former bookkeeper at Auschwitz goes on trial in Germany on Tuesday, accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. The trial of Groening, who was 21 and by his own admission an enthusiastic Nazi when he was sent to Auschwitz in 1942, may turn out to be one of the last big Holocaust trials because so few Nazis suspected of committing crimes during World War Two are still alive. REUTERS/Fabian Bimmer

Luca Hartai (L) and her grandmother Eva Pusztai-Fahidi (C) a survivor of Auschwitz German Nazi concentration and extermination camp, arrive at the court in Lueneburg April 21, 2015, for the opening of the trail against Oskar Groening. A 93-year-old former bookkeeper at Auschwitz goes on trial in Germany on Tuesday, accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. The trial of Groening, who was 21 and by his own admission an enthusiastic Nazi when he was sent to Auschwitz in 1942, may turn out to be one of the last big Holocaust trials because so few Nazis suspected of committing crimes during World War Two are still alive. REUTERS/Fabian Bimmer TPX IMAGES OF THE DAY

Defendant Oskar Groening arrives for his trial in a courtroom in Lueneburg April 21, 2015. A 93-year-old former bookkeeper at Auschwitz goes on trial in Germany on Tuesday, accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. The trial of Groening, who was 21 and by his own admission an enthusiastic Nazi when he was sent to Auschwitz in 1942, may turn out to be one of the last big Holocaust trials because so few Nazis suspected of committing crimes during World War Two are still alive. REUTERS/Ronny Hartmann/Pool TPX IMAGES OF THE DAY

Defendant Oskar Groening arrives for his trial in a courtroom in Lueneburg April 21, 2015. A 93-year-old former bookkeeper at Auschwitz goes on trial in Germany on Tuesday, accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. The trial of Groening, who was 21 and by his own admission an enthusiastic Nazi when he was sent to Auschwitz in 1942, may turn out to be one of the last big Holocaust trials because so few Nazis suspected of committing crimes during World War Two are still alive. REUTERS/Ronny Hartmann/Pool

Defendant Oskar Groening arrives for his trial in a courtroom in Lueneburg April 21, 2015. A 93-year-old former bookkeeper at Auschwitz goes on trial in Germany on Tuesday, accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. The trial of Groening, who was 21 and by his own admission an enthusiastic Nazi when he was sent to Auschwitz in 1942, may turn out to be one of the last big Holocaust trials because so few Nazis suspected of committing crimes during World War Two are still alive. REUTERS/Ronny Hartmann/Pool

Defendant Oskar Groening arrives for his trial in Luneburg April 21, 2015. A 93-year-old former bookkeeper at Auschwitz goes on trial in Germany on Tuesday, accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. The trial of Groening, who was 21 and by his own admission an enthusiastic Nazi when he was sent to Auschwitz in 1942, may turn out to be one of the last big Holocaust trials because so few Nazis suspected of committing crimes during World War Two are still alive. REUTERS/Fabian Bimmer

Defendant Oskar Groening arrives for his trial in Luneburg April 21, 2015. A 93-year-old former bookkeeper at Auschwitz goes on trial in Germany on Tuesday, accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. The trial of Groening, who was 21 and by his own admission an enthusiastic Nazi when he was sent to Auschwitz in 1942, may turn out to be one of the last big Holocaust trials because so few Nazis suspected of committing crimes during World War Two are still alive. REUTERS/Fabian Bimmer TPX IMAGES OF THE DAY 

Defendant Oskar Groening arrives his trial in a courtroom in Luneburg April 21, 2015. A 93-year-old former bookkeeper at Auschwitz goes on trial in Germany on Tuesday, accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. The trial of Groening, who was 21 and by his own admission an enthusiastic Nazi when he was sent to Auschwitz in 1942, may turn out to be one of the last big Holocaust trials because so few Nazis suspected of committing crimes during World War Two are still alive. REUTERS/Julian Stratenschulte/Pool

Defendant Oskar Groening awaits the start of his trial in a courtroom in Luneburg April 21, 2015. A 93-year-old former bookkeeper at Auschwitz goes on trial in Germany on Tuesday, accused by prosecutors of being an accessory in the murder of 300,000 people, even though he was not involved in any actual killing at the notorious Nazi death camp. The trial of Groening, who was 21 and by his own admission an enthusiastic Nazi when he was sent to Auschwitz in 1942, may turn out to be one of the last big Holocaust trials because so few Nazis suspected of committing crimes during World War Two are still alive. REUTERS/Julian Stratenschulte/Pool